Marple is extremely proud when she is appointed to the board of trustees of a merchant marine training vessel whose mission is to rehabilitate young criminals. As in all of her endeavors, Miss Marple intends to take an active role in the job and even shows up to the board meeting dressed in naval blues. When a fellow trustee is poisoned just prior to his making some kind of revelation, Miss Marple decides to use her position to spend time on the ship. This upsets the vessel's fragile social network as she dispossesses blustering Captain Rhumstone from his quarters. When two ship's officers are later found murdered also, Miss Marple enlists help from her friend Jim Stringer and Inspector Craddock to expose the murderer.

　　A story of friendship, love, marriage, secrets, and lies that unfolds between two couples in one apartment during a Sunday brunch that will affect their lives forever

　　影片改编自山本崇一朗的同名漫画，内容为两名主角在10年后的原创故事，讲述在两人分别了10年后，高木同学（永野芽郁 饰）作为实习老师回到母校，而西片（高桥文哉 饰）在母校成为了体育老师，“擅长捉弄的高木同学”和“一直被捉弄的西片”的日常青春爱情故事再度开启。一天，正在看动漫的西片接到了远在巴黎的高木同学的电话，高木说自己在巴黎的学业已经完成了，接下来打算去一个梦寐以求的学校进修3周。西片以为高木无法第一时间归国，非常失落，但是还是衷心祝福高木同学前程似锦。失落的西片第二天像往常一样继续着自己的工作，谁知就在这时，高木同学又以恶作剧的方式出现在自己面前！原来高木要去进修的学校，正是自己就职的学校！两人重逢后，随着很多甜蜜回忆的暴击，辅助以新的恶作剧，西片、高木两个相识多年并且打心底爱慕对方的人，终于勇敢正视自己的内心说出了爱的告白。